DRBD performance question ?

[Ravi Wijayaratne]

Hi,

I was looking at DRBD performance numbers from 
http://www.complang.tuwien.ac.at/reisner/drbd/performance.html

From Phillip Reisner's paper I gather that protocol A
is an asynchronous protocol. Therefore protocol A
should not severely impact the write performance at
the
primary server. Is the above assertion correct ?

If it is so how is it that the performance of protocol
A on the primary side is seems to be limitted by the
network B/W ? If protocol A is asynchronous we should
see a significant difference in throughput between
protocol A and C. However they seem to be quite close.
Is this discrepency caused by write ordering or is
there a hidden bottleneck in the protocol ?

Thanks
Ravi



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Ravi Wijayaratne

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